Telephone system



March 30, 1943. F, KESSLER 2,314,990

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ATTORNEYS Patented Mar. 30, 1943 narrar een TELEPHONE SYSTEM Frank Kessler, Villa Park, Ill., assigner to Associated Electric Laboratories, Inc., Chicago, Ill., a corporation of Delaware applicati@ october 24, 194i, serial No. 416,364

57 claims. l (o1. 179-27) In a telephone system comprising both autoi natic and manual exchanges, each manual ex- "ange is provided with a switchboard which is 'pped to handle incoming calls from both the iutomatic and the manual exchanges. The section of the switchboard which is equipped to handle calls incoming from the automatic exianges usually comprises call register-anruncer apparatus adapted first to register and ien to announce or display the called telephone lumber before the selected operator position and to identify the calling cord circuit in the associated group. The operator at the selected operator position then sets up the call as announced by way of the plug terminating the calling cord fircuit and the jack terminating the called line, after the usual tipV busy test is made, performs .ne necessary key operations in order'to cause V11e called line to be rung, supervises the estab-1 :ished connection after the call is answered, Y'a'ndft lubsequently takes down the connection after the established connection is released.

While prior telephone systems of the type described are entirely satisfactory in service, more operations are required of the-operators at the switchboard in order to set up the connections than is desirable.

'Accordingly it is the principal object ofthe present invention to provide in a telephone system of the type described, improved apparatus requiring a minimum number of extremely simple operations of the operators at the switchboard in order to set up the connections.

Another object of the invention is to provide in a telephone system of the type noted, an improved arrangement for allotting the individual register sets included in the register apparatus which have called telephone numbers registered therein to the associated call announcer.

Another object of the invention is to provide in a telephone system of the type noted, an arrangement for operating the call announcer to announce a xed arbitrary character when no called telephone number is registered in the associated register set witlnn a predetermined time interval after seizure thereof. v'

Another object of the invention is to provide in a telephone system of the type noted, a register set comprisingr an improved timing arrangement for controlling the connection thereof to the 4 at least -one ofthe digits of a called Atelephone Vnumber received thereby. f

associated call announcer, whereby both complete and incomplete `or mutilated ,calls are selectively announced.

Another object of the invention is to provide in a telephone system of the type noted, ran arrangement for operating the call announcer to announce a xed arbitrary characterV when an unassigned telephone number is registered in the associated register set.

A further object of the invention is to provide in a telephone system-of the type noted, an arrangement for registering the line identity digits of a called telephone number in the register set for purposes of identifying the called line and yfor registering the signal digit of a called telephone number in the lconnected cord circuit for purposes of selecting the Asignaling to -be'periormedover the called line. f

A further object of theinvention is to provide in atelephone systemof the type noted, acord circuit comprising an arrangement yfor absorbing Anotherobject of the invention is vto provide in a telephone'system of the type noted, a cord circuit comprising an improved control arrangeproved arrangement for transferring incoming trunksbet-Ween two groups ofv cord circuits Vrespectively associated with two operator positions'at the switchboard.

. A further obje-ct ofthe invention is Yto provide in a telephonesystem-of the type noted, an arrangement for completely registering thedirst vdigit of the called telephone number i-n thecord circuit and then for transmitting the rst digit registered to the associated register set Yto be -registeredv therein, thereby to permit ample time for the association of the register set with the cord circuit.

A further object of the .invention is to provide inra telephone system of vthe. type noted, a cord circuit ccmprising'faci-lity for registering .both the first` line identity `digit and the Yring digit cfa called telephone number.

A Efurther object ofthe invention is to anl improved arrangement for -eifectively transferring a registered number from .a register set to aV numerical line selecting switch wherein theV complement of the registered number is actually transferred. l

provide A 

